Question

Define a simple machine
When is work said to be done
What is a wheel and axle? Give two examples of wheel and axle
What do you mean by opaque materials

Answer 1

Explanation:

A second variation of the lever is the simple machine known as a wheel and axle. A wheel and axle consists of two circular pieces of different sizes attached to each other. The larger circular piece is the wheel in the system, and the smaller circular piece is the axle. One of the circular pieces can be considered as the effort arm of the lever and the second, the resistance arm. The place at which the two are joined is the fulcrum of the system

Answer 2

Opaque Materials Don't allow light to pass through them.